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Rigler sign (pneumoperitoneum)

Case contributed by Mohammad Taghi Niknejad
Diagnosis certain

Patient Data

Gender: Female
x-ray

Annotated image

Annotated image.

Case Discussion

Rigler sign is a reliable indicator of pneumoperitoneum on a supine abdominal radiograph. The internal and external air (in bowel and in the peritoneal space, respectively) highlights the bowel wall, like a smooth line.

There is a large dome sign as well.

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